Final Fantasy VII, but I value my "favorite" thing differently than others.
I remember the day very well, I was young of course the game was fairly new, but I'm not sure the exact year I'm afraid. My older brother stopped by to see our mother, he had been moved out at this point in his life. He asks me if I want two PlayStation games of his that he doesn't ever play. One of them was Metal Gear Solid (another one of my favorite games/series) and Final Fantasy VII.
At that point in my life, I knew nothing of Final Fantasy or JRPGs, this was an entirely new concept for me. This was the moment when my entire lifestyle would shape into what type of person I am today.
Of course, I fell in love with Final Fantasy VII after playing it. It fostered my imagination as a child with my cousins, who also had the game as well. So many places to explore, epic battles to take place in, and a story to follow along with it.
Final Fantasy VII fueled my love for the series, as well as RPGs in general. It also gave me the passion and drive to create my own stories, and even my own games. My cousins and I would play with fake swords and come up with ideas for our own adventures, and as we grew older we molded these memories and ideas into something that we one day wish to create into a game of our own.
This game has driven me to learn how to program which I did at an early age (14 or so) and turn my hobby and my dreams into reality. One day I hope to realize these dreams and make something that all can enjoy, that is my life's goal. Without this game, the person I am today would not be the same. It has always been an important part of my life both in childhood and throughout the years for the inspiration it has given me.
Sorry for my long winded explanation, I've cut a lot of fluff out to not bore anyone. I figured that some people might be interested why I consider it my favorite.